mod = 1000000007
eps = 10**-9


def main():
    import sys
    input = sys.stdin.readline

    N, M = map(int, input().split())
    A = list(map(int, input().split()))

    ok = 0
    ng = 10 ** 9 + 1
    mid = (ok + ng) // 2
    while ng - ok > 1:
        x = 0
        flg = 1
        for a in A:
            x += a - M * mid
            if x < 0:
                flg = 0
                break
        if flg:
            ok = mid
        else:
            ng = mid
        mid = (ok + ng) // 2
    print(ok)


if __name__ == '__main__':
    main()